IS 2268 : 1994 ( Reaffirmed 2004 ) Indian Standard ELECTRICAL CALL BELLS AND BUZZERS FOR INDOOR USE -SPECIFICATION ( Third Revision ) UDC 643.62 : 654.923 - 83 @ BIS 1994 BUREAU MANAK OF BHAVAN, 9 INDIAN BAHADUR DELHI STANDARDS SHAH 110002 Price Group 1 ZAFAR MARG NEW April 1994 Electrical Appliances Sectional Committee, ET 32 FOREWORD This Indian Standard was adopted by the Bureau by the Electrical Appliances Sectional Committee Division Council. This standard covers the general buzzers for indoor use. safety and of Indian had been Standards, approved after the draft finalized by the Electrotechnical of electric call bells and performance requirements This standard was originally published in 1963, the first revision was made in 1966 and the second revision in 1988. As per the decision of the third meeting of Electrotechnical Division Council, a separate safety standard on electric call bells and buzzers for indoor use has been brought out. In the third revision of this composite standard instead of giving details of safety requirements, reference has been made to safety standard, IS 302-2-203 ( 1994 ) `Safety of household and similar electrical appliances: Part 2 Particular requirements, Section 203 Electric call bells and buzzers for indoor use'. It is intended to cover some more performance requirements in future on the basis of future development within the country as also at the International level. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 `Rules for rounding off numerical values ( revised )`. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. IS 2268 : 1994 Indian Standard ELECTRICAL CALL BELLS AND BUZZERS FOR INDOOR USE- SPECIFICATION ( Third Revision ) 1 SCOPE 1.1 This standard covers the general safety and performance requirements for electrically operated call bells and buzzers for indoor use, designed for connection to supplies at voltage not exceeding 250 V ac single phase 50 HZ or dc. may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. 9 SAFETY REQUIREMENTS 9.1 The call bells or buzzers shall comply with the requirements given in 8 to 32 of IS 302-2-203 ( 1994 ). 2 REFERENCES 2.1 The following Indian Standards sary adjuncts to this standard: IS No. 302-l ( 1979 ) Title 10 ENDURANCE are neces10.1 The call bells or buzzers sha!l be so constructed that, in normal use, there will be no electrical or mechanical failure that might impair compliance with this standard. The insulation shall not be damaged and contact and connections shall not work loose as a result of heating, vibration etc. Moreover, overload protection, if any, shall not operate under normal running condition. 10.2 The bells or buzzers shall be kept in an ambient temperature not exceeding 40°C and shall be operated 10 000 times at the rated voltage with a test cycle of 1 Second `ON' and 3 Seconds `Off'. During this period, it shall not be necessary to make alljustment more than twice. At the end of the 10 000 operations, the bell or buzzer shall be in working order. 10.3 Immediately after the test of 10.2, the temperature of the winding shall be measured. The bell or buzzer being kept at the same ambient temperature as for the endurance test, the final temperature shall not exceed 80°C. During the test of 10.2, overload protection, if any, shall not operate. After the test of 10.2, the call bell or buzzer shall withstand the test of electric strength as given in 16.4 of IS 302-l ( 1979). NOTE-For Safety of household and similar electrical appliances: Part 1 General requirements ( jijih revision ) 302-2-203 ( 1994 ) Safety of household and similar electrical appliances : Part 2 Particular requirements Section 203 Electric call bells and buzzers for indoor use 3 TERMINOLOGY 3.1 Clause 2 of IS 302-2-203 ( 1994 ), shall apply. 4 GENERAL REQUIREMENTS 4.1 Clause 3 of IS 302-2-203 ( 1994 ), shall apply. 5 GENERAL NOTES AND TESTS 5.1 Clause 4 of IS 302-2-203 ( 1994 ), shall apply. 6 RATING 6.1 Clause 5 of IS 302-2-203 (1994 ), shall apply. 7 CLASSIFICATION 7.1 Clause6 of IS302-2-203 ( 1994), shall apply. 8 MARKING 8.1 Clause 7 of IS 302-2-203 (1994), shall apply. 8.1.1 The use of the Standard Mark is governed by the provisions of Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The details of conditions under which the licence for the use of Standard Mark 1 the purpose of endurance test, the operating period for the tzstspecified in 11, 12 and 13 of IS 302-2-203 ( 1994 ) is included, 11 FINISH finish ponents shall be of a heat nature, and shall not be variations of temperature ting conditions or during 11.1 The external used on metal comand moisture resisting adversely affected by under normal operathe endurance test. f,S 2268:1991 shall be checked by visual inspection after endurance test. 12 OPERATION AT OVER VOLTAGES AND UNDER VOLTAGE 12.1The call bells and buzzers shall operate satisfactorily at the over voltage and under voltage as specified below: Rated Voltage Over Voltage Under Voltage Single value Rated voltage Rated voltage + 10 percent - 10 percent Range of Maximum Minimum voltage voltage of voltage of the range the range - 10 percent + 10 percent 13 TESTS 13.1 Type Tests The tests specified in Table 1 shall constitute the type tests and shall be carried out on two samples of call bell or buzzers of the same type and rating selected preferably at random from a regular production lot. Before commencement of the tests, the call bells or buzzers shall be visually examined and inspected for obvious visual defects in respect of components, parts, and their assembly, construction, mechanical hazards, markings, provision of suitable terminals for supply connections, earthing and the effectiveness of screws and connections. The external surface finish shall be even and free from finishing defects. 13.1.1 Criteria of Acceptance Both samples shall successfully pass all the type tests for proving conformity with the requirements of the standard. If any of the samples fails in any of the type tests, the testing authority at its discretion, may call for fresh samples not exceeding twice the original number and subject them again to all tests or to the test( s ) in which failure( s ) had occurred. No failure should be permitted in the repeat test(s). Table 1 Schedule of Type Tests ( Clause 13.1 ) i) 11.2Compliance 13.2 Acceptance Tests The following shall constitute tests: Test against a) Protection electric shock b) Input c) Temperature rise the acceptance Clause Reference 8 of IS 302-2-203 ( 1994) 10 of IS 302-2-203 ( 1994) 11 of IS 302-2-203 ( 1994) 12 of IS 302-2-203 ( 1994 ) insulation d) Electrical and leakage current at operating temperature e) Moisture resistance 15 of IS 302-2-203 ( 1994) 16 of IS 302-2-203 ( 1994 ) f) Insulatio.1 resistance a?d electric strength ( after humidity treaiment ) g) Provision for earthing NOTE 27 of IS 302-2-203 ( 1994) - For the purpose of acceptance tests, the humidity treatment shall be done for 24 hours while conducting the test for moisture resistance ( 15 ). 13.2.1 A recommended sampling procedure for acceptance tests is given in Annex B of IS 302-l ( 1979 ). 13.3 Routine Test The following shall constitute Test against a) Protection electric shock b) High voltage c) Provision for earthing the routine CIause 8 of IS 302-2-203 ( 1994 ) 13.3.2 of IS 302-l ( 1979 ) 27 of IS 302-2-203 ( 1994) tests: Safety req.uirements voltage 8 to 32 of IS 302-2-;;3 ( 1994 ) :: ii) Endurance iii) Finish iv) Operation of over under voltage Bareao of Indian Standards established under the Bureau of Indian Standards Act, 1986 to BIS is a statutory institution promote harmonious development of the activities of stadarc'ization, marking and quality certification of goods and attending to connected matters in the country. 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